Overview
The SN74LVC8T245PWG4, produced by Texas Instruments, is an 8-bit dual-supply bus transceiver designed for universal low-voltage bidirectional translation. This device allows for voltage level translation between any of the 1.8-V, 2.5-V, 3.3-V, and 5.5-V voltage nodes, making it highly versatile in various electronic systems. It features two separate configurable power-supply rails, VCCA and VCCB, which can operate within the range of 1.65 V to 5.5 V. The device is optimized for asynchronous communication between two data buses and includes control inputs for direction and output enable, allowing for flexible data transmission and high-impedance states when necessary.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| Supply Voltage Range (VCCA, VCCB) | -0.5 | 6.5 | V |
| Input Voltage Range (A and B ports) | -0.5 | 6.5 | V |
| Control Input Voltage Range | -0.5 | 6.5 | V |
| Operating Temperature Range | -40 | 85 | °C |
| Package Type | TSSOP (PW) | ||
| Number of Pins | 24 | ||
| Continuous Output Current | ±50 | mA |
Key Features
- Configurable dual-rail design allowing each port to operate over the full 1.65-V to 5.5-V power-supply range.
- VCC isolation feature – if either VCC input is at GND, all outputs are in the high-impedance state.
- Control inputs (DIR and OE) are supplied by VCCA, enabling flexible data transmission control.
- High-impedance state for both output ports when OE is high.
- ESD protection exceeds JESD 22 standards (4000-V Human-Body Model, 100-V Machine Model, 1000-V Charged-Device Model).
- Latch-up performance exceeds 100 mA per JESD 78, class II.
- Fully specified for partial-power-down applications using Ioff circuitry.
Applications
- Industrial automation systems requiring voltage level translation.
- Enterprise and telecom equipment where multiple voltage levels are used.
- Embedded systems and microcontrollers that need to communicate across different voltage domains.
- Automotive and aerospace applications where robust ESD protection and latch-up performance are critical.
Q & A
- What is the operating voltage range for the SN74LVC8T245?
The device operates within a voltage range of 1.65 V to 5.5 V for both VCCA and VCCB.
- How does the direction control work on the SN74LVC8T245?
The direction control is managed by the DIR input. When OE is low and DIR is high, data transmission is from A to B. When OE is low and DIR is low, data transmission is from B to A.
- What happens when the OE input is high?
When the OE input is high, both output ports will be in the high-impedance state.
- What is the purpose of the VCC isolation feature?
The VCC isolation feature ensures that if either VCC input is at GND, all outputs are in the high-impedance state.
- Does the SN74LVC8T245 have ESD protection?
- What is the latch-up performance of the SN74LVC8T245?
The latch-up performance exceeds 100 mA per JESD 78, class II.
- Can the SN74LVC8T245 be used in partial-power-down applications?
- What is the maximum continuous output current for the SN74LVC8T245?
The maximum continuous output current is ±50 mA.
- What are the available package types for the SN74LVC8T245?
The device is available in TSSOP (PW), SSOP (DBR and DBQ), TVSOP (DGV), and VQFN (RHL) packages.
- What is the operating temperature range for the SN74LVC8T245?
The operating temperature range is -40°C to 85°C.
